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  <title>返回字符串的宽度</title>

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</div><hr /><div id="function.mb-strwidth" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mb_strwidth</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.6, PHP 5)</p><p class="refpurpose"><span class="refname">mb_strwidth</span> &mdash; <span class="dc-title">返回字符串的宽度</span></p>

 </div>
   
 <div class="refsect1 description" id="refsect1-function.mb-strwidth-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">int</span> <span class="methodname"><strong>mb_strwidth</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$encoding</code></span>
  ] )</div>

  <p class="para rdfs-comment">
   返回 <span class="type"><a href="language.types.string.html" class="type string">string</a></span> 类型 <em><code class="parameter">str</code></em> 的宽度。
  </p>
  <p class="para">
   多字节字符通常是单字节字符的两倍宽度。
  </p>
  <p class="para">
   <table class="doctable table">
    <caption><strong>字符宽度</strong></caption>
    
     <thead>
      <tr>
       <th>字符</th>
       <th>宽度</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>U+0000 - U+0019</td>
       <td>0</td>
      </tr>

      <tr>
       <td>U+0020 - U+1FFF</td>
       <td>1</td>
      </tr>

      <tr>
       <td>U+2000 - U+FF60</td>
       <td>2</td>
      </tr>

      <tr>
       <td>U+FF61 - U+FF9F</td>
       <td>1</td>
      </tr>

      <tr>
       <td>U+FFA0 -      </td>
       <td>2</td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.mb-strwidth-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">str</code></em></dt>

     <dd>

      <p class="para">
       待解码的 <span class="type"><a href="language.types.string.html" class="type string">string</a></span>。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">encoding</code></em></dt>

     <dd>

      <p class="para"><em><code class="parameter">encoding</code></em>
参数为字符编码。如果省略，则使用内部字符编码。</p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.mb-strwidth-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   <span class="type"><a href="language.types.string.html" class="type string">string</a></span> <em><code class="parameter">str</code></em> 的宽度。
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mb-strwidth-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.mb-strimwidth.html" class="function" rel="rdfs-seeAlso">mb_strimwidth()</a> - 获取按指定宽度截断的字符串</span></li>
    <li class="member"><span class="function"><a href="function.mb-internal-encoding.html" class="function" rel="rdfs-seeAlso">mb_internal_encoding()</a> - 设置/获取内部字符编码</span></li>
   </ul>
  </p>
 </div>


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